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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 3 Months Ended
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Mar. 31, 2022
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS). |
Activity in Accumulated Other Comprehensive Income (Loss), Net of Tax | Activity in accumulated other comprehensive income (loss), net of tax, was as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Total
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | ​ | ​ | Defined | ​ | ​ | ​ | ​ | Other
​ | ​ | ​ | ​ | Benefit | ​ | ​ | ​ | ​ | Comprehensive
(In thousands) |  | Securities |  | Plans |  | Derivatives |  | Income (Loss)
Balance as of January 1, 2022 | ​ | $ | (7,864) | ​ | $ | (1,306) | ​ | $ | 2,989 | ​ | $ | (6,181)
Other comprehensive (loss) income before reclassifications | ​ |  | (48,075) | ​ |  | 683 | ​ |  | 4,697 | ​ |  | (42,695)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 116 | ​ |  | (641) | ​ |  | 21 | ​ |  | (504)
Net other comprehensive (loss) income during the period | ​ |  | (47,959) | ​ |  | 42 | ​ |  | 4,718 | ​ |  | (43,199)
Balance as of March 31, 2022 | ​ | $ | (55,823) | ​ | $ | (1,264) | ​ | $ | 7,707 | ​ | $ | (49,380)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, 2021 | ​ | $ | 12,694 | ​ | $ | (6,086) | ​ | $ | (12,532) | ​ | $ | (5,924)
Other comprehensive (loss) income before reclassifications | ​ |  | (10,570) | ​ |  | 1,659 | ​ |  | 16,476 | ​ |  | 7,565
Amounts reclassified from accumulated other comprehensive loss | ​ |  | (822) | ​ |  | (288) | ​ |  | — | ​ |  | (1,110)
Net other comprehensive (loss) income during the period | ​ |  | (11,392) | ​ |  | 1,371 | ​ |  | 16,476 | ​ |  | 6,455
Balance as of March 31, 2021 | ​ | $ | 1,302 | ​ | $ | (4,715) | ​ | $ | 3,944 | ​ | $ | 531
Other Comprehensive Income (Loss) | The before and after tax amounts allocated to each component of other comprehensive income (loss) are presented in the table below for the periods indicated.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​
​ | ​ | March 31, | ​
(In thousands) | ​ | 2022 |  | 2021 | ​
Change in unrealized gain (loss) on securities: | ​ |  |  | ​ |  |  | ​
Change in net unrealized gain (loss) during the period | ​ | $ | (70,131) | ​ | $ | (15,534) | ​
Reclassification adjustment for net gains included in net gain on sale of securities and other assets | ​ |  | — | ​ |  | (1,187) | ​
Accretion of net unrealized loss on securities transferred to held-to-maturity | ​ | ​ | 170 | ​ | ​ | — | ​
Net change | ​ |  | (69,961) | ​ |  | (16,721) | ​
Tax benefit | ​ |  | (22,002) | ​ |  | (5,329) | ​
Net change in unrealized gain (loss) on securities, net of reclassification adjustments and tax | ​ |  | (47,959) | ​ |  | (11,392) | ​
Change in pension and other postretirement obligations: | ​ |  |  | ​ |  |  | ​
Reclassification adjustment for expense included in other expense | ​ |  | (934) | ​ |  | (422) | ​
Reclassification adjustment for curtailment loss | ​ | ​ | — | ​ | ​ | 1,543 | ​
Change in the net actuarial gain (loss) | ​ |  | 997 | ​ |  | 885 | ​
Net change | ​ |  | 63 | ​ |  | 2,006 | ​
Tax expense | ​ |  | 21 | ​ |  | 635 | ​
Net change in pension and other postretirement obligations | ​ |  | 42 | ​ |  | 1,371 | ​
Change in unrealized gain (loss) on derivatives: | ​ |  |  | ​ |  |  | ​
Change in net unrealized gain (loss) during the period | ​ |  | 6,852 | ​ |  | 4,948 | ​
Reclassification adjustment for loss included in loss on termination of derivatives | ​ | ​ | — | ​ | ​ | 16,505 | ​
Reclassification adjustment for expense included in interest expense | ​ |  | 31 | ​ |  | 854 | ​
Net change | ​ |  | 6,883 | ​ |  | 22,307 | ​
Tax expense | ​ |  | 2,165 | ​ |  | 5,831 | ​
Net change in unrealized gain (loss) on derivatives, net of reclassification adjustments and tax | ​ |  | 4,718 | ​ |  | 16,476 | ​
Other comprehensive (loss) income, net of tax | ​ | $ | (43,199) | ​ | $ | 6,455 | ​

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